On 01/12/2020 23:48, Michael Chare wrote:

When I have put sealant around window frames I have put masking tape on
each side of the where I want the sealant to be. The tape must be
removed immediately after the sealant has been applied.Â* If I ever
replace the sealant where my kitchen worktops meet the walls I plan to
use the same technique.

I do the same - it works very well.